Bob Rouleau

Our local track is rigidly enforcing a 92dBA limit. My RS got busted. I have ordered Soul down pipes with resonators. Until they arrive I need a temporary solution. Is there any easy way to force the exhaust valves to stay in the quiet position? I found a simple trick for the 997 version but the 2019 is veery different. Other club members with GT3 and GT4 would also appreciate this trick if it exists.

Best,

TRAKCAR

Ugh, even there now.

Its crazy that our cars are legal on the road but illegal on many races tracks.
A German shop made me this to try and pass local 86 dB tracks..

SOUL could work at 92dB depending on how and where they measure.
Might have to add some steel wool.

uniqueMR

WTH

Jamie140

soulsea

Dear Canadian time traveler, tell us the wonders of your civilization?!

Marv

Yeah, by 20,019 AD I suspect the internal combustion engine to be extinct.

Jamie140

http://getyarn.io/yarn-clip/1a7e3834-5956-423a-873d-7207cef81d6d

usctrojanGT3

The Dundon quiet muffler might be the way to go for you.

bli8

These are suppose to cut sound by up to 5 dB. Should be enough to pass sound.

https://www.jcr-developments.com/por...d-exhaust-tips

obbob

Easiest solution is to find out where the sound mic station is located, and then lift or go into 2 gears higher than usual when you pass by it.

Dougr743

2 long pieces of rad tubing, use the bent tube, cut them and clamp them down towards the pavement. Simple trick, won't melt, bend if you hit something and will drop the sound wave big time. Been doing it to motorcycles for years.

Jrtaylor9

Those have allowed me to pass some notoriously difficult noise tracks in the UK. It's not just the dB limit; it's where and how many of the meters there are. The JCR solution has worked very well for me so far when I've seen other P-GT's sent home for noise.

A/S

The stock 991 or 991.2 GT3 won't pass a 92 dBA limit at 50ft on the stock exhaust. The stock exhaust at 50ft is reading anywhere from 92 dBA to 101 dBA depending on conditions (wind, clouds, etc.).

The Soul Performance turn-downs are excellent, the resonated tips (which I use as permanent tips) reduce 2dBA at 50ft, and the turndowns another 2-3 dBA, but the car could exceed 92dBA even with these turn downs.

Using metal wire to keep the valves forcibly closed is dangerous to the engine, the upper path for the muffler flows through a 50mm diameter straw, whereas the lower path enters at 63mm and exits at 59mm. Despite of the 9mm difference, there is a 30% flow reduction due to the diameter of the system with the valves closed, and the stock exhaust is already restricted with the valves open (my car gained confirmed power by eliminating the stock side and center exhaust and installing JCR Silenced Race Pipes).

The solution for 92 dBA:

- Dundon Quiet Muffler + Dundon turn away or turn down pipes (depending on what's allowed, turn aways are being banned too).

sechsgang

This

Chris3963

These Akrapovic silencers are the best looking ones I have seen. They were on a GT3 at Spa recently and looked pretty cool.